Replace glob w/ fs.glob

[ChristianMurphy]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and discussions and couldn’t find anything or linked relevant results below
• I made sure the docs are up to date
• I included tests (or that’s not needed)

Description of changes

Closes #91.

This replaces the deprecated glob@10 with fs.glob from Node.
It needs a major release: the minimum Node version goes from 16 to 22.17, the first 22.x release where fs.glob is stable.

• lib/finder.js calls fs.glob(pattern, {cwd}, callback)
• Node has no hasMagic, so new Minimatch(pattern).hasMagic() decides what counts as a glob; with default options it is the same check as before, where \ escapes the next character
• the readme and the CI matrix move to Node 22.17 and lts/jod
• a new test covers a glob through a symlinked folder

Behavior changes compared to glob@10:

• globs no longer look inside symlinked folders.
  glob@10 followed one level of links, except under a leading **.
  So **/*.md gives the same results as before.
  But */readme.md and docs/**/*.md no longer find files through a linked folder.
  A glob or path that names the link itself still works, because the engine then reads that folder
• inside a glob, \ is a path separator instead of an escape
• a pattern with .. that points back into cwd reports paths such as ../dir/file.md; glob@10 reported file.md
• on Node 20 and lower, the first glob throws TypeError: fs.glob is not a function

I left out followSymlinks on purpose.
Node 22 ignores it.
On Node 24.16+, it follows links at every depth under **.
Then **/*.md would crawl pnpm dependencies and process npm workspace packages twice.

The install warning stays until wooorm/load-plugin#22 lands, because load-plugin still brings in glob@10 through @npmcli/config.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6f35eae) to head (11272d5).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #94   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines         3214      3206    -8     
=========================================
- Hits          3214      3206    -8     

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